Plate amplifier question

I've got a Dayton Audio SA100 subwoofer plate amplifier.

https://www.daytonaudio.com/product/778/sa100-100w-subwoofer-plate-amplifier

Two questions.

1, Is there a way to increase the sensitivity of the turn on circuit? I use it at work and use bookshelf speakers on my desk meaning the sub is real close to me and for normal listening levels, the sub often won't kick on.

2. The amp best as I can remember since new has had a rather large turn on thump.

Is there a way to fix that?

If I could fix #2, I wouldn't need to worry about #1 as I could turn the auto on to always on and switch it with the power strip that switches the rest of the system on and off.

Also given I use an external active two way crossover and the only way to "disable" the plate amp crossover is to turn it to its highest frequency, is it possible to bypass the crossover?
 
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